package com.atguigu.educenter.controller;

import com.atguigu.commonutils.JwtUtils;
import com.atguigu.educenter.entity.UcenterMember;
import com.atguigu.educenter.service.UcenterMemberService;
import com.atguigu.educenter.utils.ConstantWxUtils;
import com.atguigu.educenter.utils.HttpClientUtils;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.google.gson.Gson;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.net.URLEncoder;
import java.util.HashMap;

/**
 * @author tianxinyu
 * @create 2020-10-29 16:29
 */
@CrossOrigin
@Slf4j
@Controller
@RequestMapping("/api/ucenter/wx")
@Api("使用微信进行登录验证")
public class WxApiController {
    @Autowired
    private UcenterMemberService memberService;

    //获取扫描人信息
    @GetMapping("/callback")
    public String callback(String code,String state){
        try{
        //1 获取code值， 临时票据， 类似于验证码


        //2 拿着code请求 微信固定的地址， 得到两个值 access_token 和openid
        //向认证服务器发送请求换取access_token
        String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                "?appid=%s" +
                "&secret=%s" +
                "&code=%s" +
                "&grant_type=authorization_code";

        String accessTokenUrl = String.format(
                baseAccessTokenUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                ConstantWxUtils.WX_OPEN_APP_SECRET,
                code);
        //请求这个拼接好的地址，得到返回两个值 access_token 和open_id
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);
//            String result = null;

            System.out.println("accessTokenInfo"+accessTokenInfo);
            //从accessTokenInfo字符串获取出来两个值access_token 和open_id
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token =(String) mapAccessToken.get("access_token");
            String openid =(String) mapAccessToken.get("openid");




            //将扫码人信息添加到数据库中
            UcenterMember member = memberService.getOpenIdMember(openid);
            if(member==null){
                //3 、得到扫码人的信息
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                String userInfoUrl = String.format(baseUserInfoUrl, access_token, openid);
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
//            System.out.println("userInfo:"+userInfo);

                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String  nickname = (String)userInfoMap.get("nickname");
                String  headimgurl = (String)userInfoMap.get("headimgurl");



                //member是空，表没有相同威信县数据，进行添加
                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }
            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());

            return "redirect:http://localhost:3000?token="+jwtToken;
        }catch(Exception e){
            e.printStackTrace();
            throw new GuliException(20001,"日了狗了");
        }
    }


    //使用微信生成二维码
    @ApiOperation("使用微信生成二维码")
    @GetMapping("/login")
    public String getWxCode(){

// 微信开放平台授权baseUrl
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        // 回调地址
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL; //获取业务服务器重定向地址
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "UTF-8"); //url编码
        } catch (Exception e) {
            throw new GuliException(20001, e.getMessage());
        }

        // 防止csrf攻击（跨站请求伪造攻击）
        //String state = UUID.randomUUID().toString().replaceAll("-", "");//一般情况下会使用一个随机数
        String state = "imhelen";//为了让大家能够使用我搭建的外网的微信回调跳转服务器，这里填写你在ngrok的前置域名
        System.out.println("state = " + state);

        // 采用redis等进行缓存state 使用sessionId为key 30分钟后过期，可配置
        //键："wechar-open-state-" + httpServletRequest.getSession().getId()
        //值：satte
        //过期时间：30分钟

        //生成qrcodeUrl
        String qrcodeUrl = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                state);

        return "redirect:" + qrcodeUrl;
    }

}
